Self-measuring oil-pump.



No. 790,787. PATENTED MAY 23, 1905. J. B. DAVIS & F. W. SHBLLABARGER.

SELF MEASURING OIL PUMP.

APPLICATION FILED D110. 17, 1904 2 SHEETS-SHEET 1.

IEI'III'IIIIIIII lllllll llj fl n PATENTED MAY 23,1905.

J. B. DAVIS-8: F. W. SHELLABARGER.

SELF MEASURING OIL PUMP.

APPLICATION FILPD DEG 17 1904 2 SHEETS-SHEET 2.

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UNiTnn STATES Patented May 23, 190E.

PATENT Option.

JOHN B. DAVIS AND FLAVIUS W. SHELLABARGER, OF DAYTON, OHIO.

SELF-MEASURING OIL-PUMP.

SPECIFICATION forming part of Letters Patent No. 790,787, dated May 23, 1905.

Application filed December 17, 1904. Serial No. 237,351.

To all whom, it may concern.-

Be it known that we,J0HN B. DAVIS and FLA- VIUS W. SHELLABARGER, citizens of the United States, residing at Dayton. in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Self- Me-asuring Oil-Pumps; and we do declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

This invention relates to new and useful improvements in self-measuring oil-pumps of the class adapted for use in retailing oil in quantities of gallons and less.

The object of the invention is to provide such pump with a capacity for measuring and discharging oil upon each single stroke of the operating-shaft; and to this end the invention consists of a triplex pump having the features hereinafter described and claimed.

Preceding a detail description of the invention reference is made to the accompanying drawings, of which Figure 1 is a front elevation of a triplex pump made in accordance with our invention. Fig. 2is a side elevation of the pump, the oiltank and base being shown in section, part of said oil-tank also broken away. Figs. 3 and 4 are detail views of the gearing through which the pump-rods are reciprocated in opposite directions in the operation of filling and discharging the cylinders. Fig. 5 is an elevation of the rear side of the pump from that shown in Fig. 1. Fig. 6 is an enlarged horizonal sectional View of the pump-cylinders on the line m m of Fig.5. Fig. 7 is a vertical sectional elevation on the line 3 of Fig. 6. Fig. 8 is a detail view of the continuous indicatoractuating mechanism. Fig. 9 is an enlarged view of a computing-scale by means of which the value of the quantities of oil in less than gallon quantities is indicated.

In adetail description of the invention simi-.

lar reference characters indicate corresponding parts. The oil-tank 1 may be of any suitable capacity and is inclosed by a lid, with suitable openings for mounting the pump, which consists of two cylinders 2 2 of equal size and of any desired capacity. In the present instance each cylinder has aone-half-gallon capacity. These cylinders are located within the oil-tank submerged in the oil.

3 designates a cylinder-base which contains suitable chambers 10 and 11, the former being controlled by a suction-valve 8 and chamber 11 being supplied through a similar valve 9.

Below each of the pistons 4 there is an inletport 12 leading to the cylinder and through which the oil is conveyed under suction to said cylinder and is expelled under pressure from the piston. The piston in each cylinder is provided with the usual packing-cup 6, pressed out in suitable contact with the interior surfaces of the cylinders by rings 5, which lie in grooves against the inner sides of the packing-cups.

13 designates a pipe leading from each' of the chambers 11 and conveying the oil to the discharge-spout 15.

The base 3 is braced to the upper base 16 on one side of the supply-pipe 13 and on the other side by a tie-rod 14, said base 16 being supported upon the top of the oil-tank.

Rising from the base 16 are a suitable number of standards constitutinga framework 17, which supports at its upper end front and back plates 20. 21 designates a crank-shaft which is journaled in said plates 20 and has upon an end thereof a hand-crank 22. Mounted upon said shaft between the plates 20 is a spur-wheel 18, which meshes on each side with racks 25 and 26. The lower ends of these racks terminate in heads 27, extending outwardly at right angles and connecting with the piston-rods 7 7. The racks are guided in their vertical reciprocating movements by the blocks 29, which constitute an upper portion of the superstructure of framework 17. and the said racks are also guided by the front and rear plates 20. It will be seen that in turning the spur-wheel 18 by means of the crank-handle the rack-bars will be elevated and lowered alternately, and the pump-rods 7 7 will thus impart reversed movements to the pistons 4, and that when one of the cylinders is discharging its contents through the pipe 13 and spout 15 the other cylinder is receiving. There is also mounted on the crankshaft 21 a pinion 23, which engages a segment-gear 24E, pivoted to the upper frame.

28 designates two arms which are pivoted to the body of the segment-gear 24 and are drawn together by a spring 30, the upper ends of said arms being provided each with double-tooth ratchet-pawls 31, which engage a ratchet wheel 32 at opposite sides, said ratchet-wheel being mounted upon a shaft 33, that carries a pointer 34, that moves over the face of acontinuous-measuring dial 35. This indicating mechanism is instrumental in ascertaining at any time the total quantity of oil that has been drawn from the tank. The double-tooth pawls 31 are instrumental in obviating any lost motion between the movements of the arms 28 and the ratchet-wheel 32.

A very useful and important feature of our invention comprises a computing-scale 36 for ascertaining the value of quantities of oil in less than gallons and at any current rate per gallon. In the present instance this scale shows six longitudinal divisions, each of which is utilized in connection with oil sold at a different price per gallon. In the use of this class of self-measuring pumps for dispensing oilsuch, for example, as keroseneit has been found in the actual practice that a single permanent scale is notsufficient, owing to the fluctuating prices of oil, and it has been further found that the use of anumber of interchangeable scales is impractical, owing to the necessity of searching for the particular scale of prices and the delay and annoyance in placing such scale in position prior to the operation of dispensing the oil. We therefore avoid these difficulties by having a single computingscale by which the various prices of different quantities of oil at different prices per gallon is readily ascertainable. This scale as a whole is a permanent feature, being attached to the superstructure 20. The different prices per gallon are arranged upon an index-bar 37, which is movable up and down the scale by being attached to one of the racks. The figures upon this index-bar are in positions to register with the longitudinal divisions of the scale, and each figure cooperates with the figures in a respective column on the scale. It will be observed that the figures in said scale-divisions are readable up and down, and in practice the figures that are readable down should be set forth in contrasting colors from those that are readable up for example, black and red.

Having described the structural features of our invention, we will now detail briefly the operation thereof. We have hereinbefore stated that an operation of a single crankshaft 21 by means of the crank-handle will discharge one cylinder and fill the other. This is true if one complete operation of said crank-handle takes place, and a full measure of the cylinder will be discharged in such event. In this case the index-bar 37 will move the entire length of the computing-scale, either down or up, according to the direction of movement of the rack-bar upon which it is supported. As the computingscale 36 is shown it would require a complete movement of said index-bar in both directions to indicate the prices of a gallon of oil, said scale having a capacity for showing the value of a half-gallon. If a quantity less than a onehalf gallon is sold at any particular price per gallon-for example, five cents worth of oil at eighteen cents per gallon the value of said quantity is ascertained when the index-bar 37 arrives at the figure 5, going either down or up in the division of the scale containing the fractional values of oil at eighteen cents per gallon.

Having described our invention, we claim 1. In a measuring-pump, two measuringcylinders with inlet and outlet valves, pumprods within said cylinders, two reciprocating racks terminating at their lower ends in heads which project outwardly and to which the up.- per ends of the pump-rods are attached, a spur-wheel meshing with said racks and driving them in opposite directions, a handle for rotating said spurwheel, a price-scale mounted upon one side of the framework of said pump, and an indicator-bar showing the various prices in gallon quantities, said indicator-bar being attached to one of the racks and being movable up and down the pricescale, as herein set forth.

2. In a pump of the type specified, two measuring-cylinders with pistons and inlet and outlet valves, two reciprocating racks terminating in heads at their lower ends with which the piston-rods are connected, apinion between said racks for driving them in opposite directions, an indicator to show the total amount of oil discharged from the tank, means interposed between the shaft of the pinion, and the indicator for indicating the total quantity of oil discharged from the cylinders, a price-scale mounted upon one side of the pump-frame and indicating the money values of oil in less than gallon quantities, and a bar attached to one of the racks and movable along the face of said scale, said bar having indicated thereon the prices of oil per gallon, as herein set forth.

In testimony whereof we a'Hix our signatures in presence of two witnesses.

JOHN B. DAVIS. FLAVIUS W. SHELLABARGER.

Witnesses:

R. J. MOCARTY, (J. M. ITHEOBALD. 

